I've just managed to get it working with CC2014.1 and the latest version of Design Extender, but not faultlessly.
I ran the wizard add content to CMS on a plain html page with the word 'text'. I set up fine, the wizard closed and then I got this attached message three times, it then asked if I wanted to put the files, I cancelled and the browser didn't launch, but also the content I added via the wizard to the CMS didn't get added to the database!
So, I previewed the page and this kick started the install process in the browser. Once this had completed, I then added content in the admin section and for some reason, this seems to have kick started the process of allowing the wizard to add content from within DW.
Any thoughts? Permissions had been granted etc.